Laboratory investigation on cooling effect of coarse rock layer and fine rock layer in permafrost regions
文献类型：期刊论文
| 作者 | Yu, WB; Lai, YM; Zhang, XF; Zhang, SJ; Xiao, JZ |
| 刊名 | COLD REGIONS SCIENCE AND TECHNOLOGY
 |
| 出版日期 | 2004 |
| 卷号 | 38期号:1页码:31-42 |
| 关键词 | permafrost thaw settlement cooling effect rock layer heat transfer porous medium |
| ISSN号 | 0165-232X |
| DOI | 10.1016/S0165-232X(03)00061-2 |
| 通讯作者 | Lai, YM() |
| 英文摘要 | Instability and failures of railway/roadway embankment are mainly caused by thaw settlement of permafrost in cold regions. To protect foundation soils beneath the embankment from thaw settlement is the primary construction principle. In the present study, the heat transfer characteristics of two cases of porous media were examined experimentally, with periodic temperature boundary at the top surface of models, while the bottom and sides were impermeable and insulated. Wind velocity over the model top kept a constant. Case 1 was coarse rock layer, with mean particle size 22 cm. Case 2 was fine rock layer (mean particle size 7 cm). The results for both cases are analyzed and compared. Results show that both the two cases have cooling effects. They can cool the soil underlying them. The cooling effect of Case 2 is better than that of Case 1. At the end of the test, temperature at the bottom of Case 2 is 3.5 degreesC colder that of Case 1. At the end of the negative and positive temperature stages, temperatures within coarse rock layer change monotonously from top to bottom, but it is no-monotonously within fine rock layer. The temperature of rock particle surface is warmer than the pore-air temperature in coarse rock layer during the positive temperature stage. A critical thickness for rock layer is necessary if they can yield cooling effects. The cooling characteristics of rock layer can be used to prevent embankment from thawing settlement and forming longitudinal cracks in permafrost regions. (C) 2004 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | VERTICAL POROUS SLOT ; NATURAL-CONVECTION ; MASS-TRANSFER ; THERMAL-CONDUCTIVITY ; COUPLED HEAT ; MEDIA ; FLOW |
| WOS研究方向 | Engineering ; Geology |
| WOS类目 | Engineering, Environmental ; Engineering, Civil ; Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000188609500003 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2555599 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Lai, YM |
| 作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Guansu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yu, WB,Lai, YM,Zhang, XF,et al. Laboratory investigation on cooling effect of coarse rock layer and fine rock layer in permafrost regions[J]. COLD REGIONS SCIENCE AND TECHNOLOGY,2004,38(1):31-42. |
| APA | Yu, WB,Lai, YM,Zhang, XF,Zhang, SJ,&Xiao, JZ.(2004).Laboratory investigation on cooling effect of coarse rock layer and fine rock layer in permafrost regions.COLD REGIONS SCIENCE AND TECHNOLOGY,38(1),31-42. |
| MLA | Yu, WB,et al."Laboratory investigation on cooling effect of coarse rock layer and fine rock layer in permafrost regions".COLD REGIONS SCIENCE AND TECHNOLOGY 38.1(2004):31-42. |
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来源：寒区旱区环境与工程研究所
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